Theoretically zero-loss design of planar dielectric waveguide Y-branch-amazing effect of serpentine-shaped taper

A novel methodology is proposed for designing a planar dielectric-waveguide Y-branch with theoretical zero-loss due to radiation. The taper section is designed so as to control the intensive power conversion and reconversion between the surface-wave mode into the desired surface-wave model at the output, while suppressing the undesired reflection at the input end. The effectiveness of the proposed concept is confirmed by comparing numerical results to those for conventional Y-branches and to measurement results.<>